Damper-regulator.



N0. 678.9l7. Patented July 23, IBM. E. G. TILDEN.

DAMPER REGULATOR.

(Application filed. Oct. 22, 1900.\

Inventor S e L Attorney s PETERS co PHD u'ma, wumuu'rou. a. c.

v and adapted to come into contact with jacket- UNITED STATES ATENT FHQE.

ELBERT G. TILDEN, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALFTO HARRY M. WILLIAMSON, OF SAME PLACE.

DAM PER-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 678,917, dated July 23, 1901.

Application filed October 22, 1900. Serial No. 33,909. (No model.)

To all whom it may concern.-

Be it known that I, ELBERT G. TILDEN, a citizen of the United States, residing at Denver, Arapahoe county, Colorado, have invented certain new and useful Improvements in Damper-Regulators, of which the following is a specification.

This invention pertaining to improvements in automatic regulators for the dampers of steam-boiler furnaces will be readily understood from the following description, taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of a portion of a steam-boiler furnace provided with my improved regulator; Fig. 2, a vertical section of the regulator, and Fig. 3 a side elevation of the moving parts of the regulator.

In the drawings, 1 indicates asmall steamcylinder; 2, a long spoo1-shaped piston moving therein; 3, asteam-pipe leadingfrom the steam-space of the boiler to the lower end of cylinder 1, so that the lower end of the piston is constantly subject to the action of steam at the pressure existing in the boiler; at, the upper head of cylinder 1; 5, a jackettnbe screwed into the upper portion of cylinder-head 4; and projecting upwardly concentric with the axis of cylinder 1; 0, a jackethead secured upon the upper end of the jacket-tube; 7, the piston-rod projecting axially upward from piston 2 through the upper portion of cylinder 1 and through jackettube 5 and its head 6 and projecting upwardly beyond jacket-head 6, its exteme upper end being non-circular and fitted for pivotal connection with the link, the lower end of the piston-rod engaging lofisely down within a-socket in piston 25 8, a stop-pin projecting from the upper portion of piston-rod 7 head 6, and thus limit the descent of the piston-rod; 9, a long threaded portion of piston-rod 7 at that portion of the piston-rod within the upper part of jacket-tube 5; 10, an anchor-disk firmly secured at the top cylinder 1 by being clampedwithin cylinder-head at by the lower end of jacket-tube 5; 11, a long helical spring disposed Within the jackettube 5 around the piston-rod 7, its lower end being secured to anchor-disk 10; 12, a nut screwing adjustably upon threaded portion 9 of the piston-rod and having the upper end of spring 11 firmly secured to it; 13, the boiler; 14:, the boiler-furnace; 15, the chim ney; 16, the damper; 17, a link connecting the damper with the upper end of piston-rod '7, so that the rising and falling of the pistonrod closes and opens the damper, and 18 a stop-valve in pipe 3.

Normally the tension of spring 11 will draw down on nut 12 and the piston-rod and piston and hold the piston-rod to the lowest position permitted by stop-pin 8. Link 17, or whatever equivalent connection may be employed between the regulator and the damper, is to be so designed as to secure an open position for the damper when the piston-rod is in the normal position above referred to. Stop-valve 18 being opened, steam at boiler-pressure will act on the lower end of piston 2 and tend to raise the piston and piston-rod and close the damper if the steampressure be sufficient to preponderate over the resistance of the spring. Boiler-pressure having been gotten to the point at which it is desired the damper shall begin to close and turned into the regulator, the piston and its rod will rise, the spring being under deficient tension; Link 1'? being disconneet ed, the piston-rod is now to be turned so as to cause nut 12 to travel farther up upon the threaded portion of the piston-rod, thus lengthening the spring and increasing its tension. This is continued till the tension of the spring has been increased sufficiently to bring stop-pin 8 down against the jackethead, after which link 17 is connected to the piston-rod. Piston 2 and the rod will now be at their lowermost positions, the damper will be open, and the parts will remain in such position until there is an increase of boiler pressure. \Vhen theboiler-pressureincreases above the desired point, then the pressure of steam under piston 2 will slightly preponderate over the tension of the spring and the piston will start to rise, thus closing the damper a trifle, the moving parts then coming to rest, a further increase in the steam-pressure serving to raise the piston still farther and close the damper still more, the moving parts of the regulator going up gradually as the ther firing.

i the piston of a steam-engine indicator, and its position, due to upward movement, may

serve in accurately showing the pressure of the steam in the boiler. Indeed, it is quite common in practice in connection with my improved regulator to rely upon its indications rather than those of the steam-gage, suitable graduations being provided to be indexed by some moving part of the regulator or its damper connections.

The long piston 2 is nicely guided within its cylinder without rigid connection with the piston-rod. By removing thelower cylinderhead the piston may be removed downwardly,- thus giving access to the cylinder and put ting the piston in hand for inspection, repacking, &c. The regulator may be disposed in any desired position consistent with proper connections to the damper and to the steam-space of the boiler.

A proper packing of the piston is of high importance to the satisfactory working of the regulator. Practice has demonstrated the efficient working of the form' of packing illustrated, the same consisting of a ring 19, of soft packing, such as is known as fibrous packing, the ring being of an exterior size to properly pack the cylinder and being disposed in a peripheral groove in the piston, the groove being of a diameter at its bottom less than the inner diameter of the packingring, thus giving room for the side shifting of the ring in the groove and also for the admission of steam within the ring, the width of the ring being less than the width of the groove in which it lies, and the flange forming one wall of the groove being somewhat smaller than the cylinder in order to facilitate the assembling of the parts.

I claim as my invention- 1. In a damper-regulator, the combination, substantially as set forth, of a cylinder ad-apt ed to have one end in free communication with the steam-space ofthe boiler, a piston the-rein, a'piston-rodconnected with the piston and adapted to 'be connected with the damper, a helical spring surrounding said piston-rod and having due end anchored to said cylinder, and a device connecting the opposite end of said spring to said piston-rod and ad justable along said piston-rod.

2. In a damper-regulator, the combination,

substantially as set forth, of a cylinder adapted to have one end in free communication with the steam-space of the boiler, a piston therein, a cylinder-head, a piston-rod engaging said piston and projecting through said piston-head and having a threaded portion, a nut upon the threaded portion of the piston-rod, a helical spring having one end secured to said nut and the other end anchored to said cylinder-head, a jacket-tube secured to said cylinder-head around said spring, and a jacket-head upon said jacket-tube and serving as a guide for said piston-rod.

3. In a damper-regulator, the combination, substantially as set forth, of a cylinder adapted to have one end in free communication with the steam'space of the boiler, a removable lower cylinder-head, a piston removable through the lower end of the cylinder and having a socket in its top, a piston-rod having its foot seated in said socket and having its upper. end adapted for connection with the damper, and a helical spring surrounding said piston-rod and having one end anchored to said cylinder and the other end adj ustably connected with said piston-rod.

i. In a damper-regulator, the combination, substantially as set forth, of a cylinder adapted to have one end in free communication with the steam-space of the boiler,.a piston therein, an upper cylinder-head an anchordisk disposed Within said upper cylinder-head,

a jacket-tube screwed in said upper cylinderhead and clamping said anchor-disk therein,

1 a piston-rod connected with said piston and projecting axially through said jacket-tube, flan'd a helical spring disposed within said 5 jacket-tube around said pi-ston-rodand having one end adjustably connected with the piston-rod and the other end fixed to said anchor-disk.

5. In a damper-regulator, the combination, substantially as set forth, of a cylinder adapted to have one end in free communicationwith the steam-space of the boiler, a piston moving freely in said cylinder and having a peripheral groove, a fibrous ring disposed within said groove and having a Width less than that of the groove and having an inner 1 diameter greater than that of the bottom of the groove, ahelical spring having connection with said piston and serving to urge the piston in a direction against the pressure of the steam thereon, means foradjusting the tension of said spring, and a connection from said piston to the damper, whereby move- I ment of the piston against the tension of the spring will tend to close the damper.

ELBERT G. TILDEN.

Witnesses: I

WM. E. REID, GEo. D. KELLER. 

